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diff --git a/src/mbgl/util/tiny_sdf.hpp b/src/mbgl/util/tiny_sdf.hpp
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+++ b/src/mbgl/util/tiny_sdf.hpp
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+#pragma once
+
+#include <mbgl/util/image.hpp>
+
+namespace mbgl {
+namespace util {
+
+/*
+    C++ port of https://github.com/mapbox/tiny-sdf, which is in turn based on the
+    Felzenszwalb/Huttenlocher distance transform paper (https://cs.brown.edu/~pff/papers/dt-final.pdf).
+    Note there exists an alternative C++ implementation from the paper’s authors at
+    https://cs.brown.edu/~pff/dt/, which this implementation is not based on.
+ 
+    Takes an alpha channel raster input and transforms it into an alpha channel
+    Signed Distance Field (SDF) output of the same dimensions.
+*/
+AlphaImage transformRasterToSDF(const AlphaImage& rasterInput, double radius, double cutoff);
+
+} // namespace util
+} // namespace mbgl